Main Entry: mo·men·tum

Pronunciation: \mō-ˈment-əm, mə-ˈment-\

Function: noun

Inflected Form(s): plural mo·men·ta \-ˈment-ə\ or momentums

: a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity ; broadly : a property of a moving body that determines the length of time required to bring it to rest when under the action of a constant force